Why ?? on this thread everyone is discussing the different options that can be enabled when enabling the extended service menu (PVR, 3D support, channel guide, etc), I don't see how asking about changing the region code on the extended service menu here is wrong.

beatfreak wrote:
2. sounds like you are in service menu and try to access the hotel mode option without having hotel mode enabled in seperate hotel mode menu (mute119...)

amuhasan wrote:Hi I have a 40c650 and i have done a great mistake on service menu !!
after i have turned off and on the panel go unstable and it turns on and off every 10 sec !! and the bottons on the panel or remote donot work. non of them. even i cannot turn off the tv how can i fix this?

You could try to reset the TV to factory condition:
With the television on, hold down the EXIT button for 15 seconds until you're given the option to RESET the TV.

Hi
thank you for your consideration
but tv turn on and off automatic every 10 sec and tv panel bottons or remote bottons donot do anything
i cannot even turn off the tv!!!

on 3018.1 you need to send the special remote buttons FACTORY and 3SPEED to enable extende service menu.
there are several methods to do this ( programmable IR, IR-didodes on audio out, LAN-control...)

beatfreak wrote:on 3018.1 you need to send the special remote buttons FACTORY and 3SPEED to enable extende service menu.
there are several methods to do this ( programmable IR, IR-didodes on audio out, LAN-control...)